What does NT$1,000,000 actually deliver after tax?
On NT$1,000,000 the South African rand account delivers about NT$70,000 pre-tax at 7%, while the Taiwan ETF distributed NT$58,626 over three quarters in 2026. After withholding, health-insurance levy and exchange costs, the ranking changes.
Start with the arithmetic that most comparisons skip: currency. At ZAR 1 = NT$1.93, NT$1,000,000 buys about R518,135. At 7%, that is R36,269 a year, That rand leg is what a South African account actually pays before currency movement.
| Layer | Taiwan high-dividend ETF (≈28.05 lots) | Rand money market account (≈R518,135) |
| (1) Pre-tax return | 2.09 TWD per unit over Q1–Q3 → NT$58,626; annualised 7.82% → NT$78,167 | About 7% → R36,269 ≈ NT$70,000 |
| (2) Taiwan NHI supplementary levy | Per payment NT$28,331, of which 62% is dividend plus interest income → NT$17,565, below the NT$20,000 threshold, so nil for now | Not applicable — offshore interest |
| (3) Income tax | Dividend income either consolidated or taxed separately at 28%; equalisation and capital-gain portions are not taxable income | South African withholding at 15%, though s50D exempts interest paid by a South African bank to a foreign person; in Taiwan, offshore income below NT$1m is not counted |
| (4) Net to holder | Depends on the individual's bracket; roughly NT$75,000 at the 5% bracket | About NT$70,000 where the exemption applies; about NT$59,500 if 15% is withheld |
Layer (2) carries a timing risk worth flagging. Taiwan's health ministry has proposed amending the National Health Insurance Act to switch the supplementary levy from a NT$20,000 per-payment threshold to a NT$20,000 annual cumulative threshold, and to raise the per-payer cap from NT$10m to NT$50m. If enacted — earliest 2027 — the same ETF position moves from a NT$17,565 levy base to NT$36,348, adding roughly NT$767 of cost. Small in isolation; it changes the cost structure South African interest is not caught by Taiwan's supplementary health levy; it falls under offshore income instead.
Layer (3) is where South Africa matters. Non-resident interest is subject to 15% withholding as a final tax, but section 50D of the Income Tax Act exempts interest paid by a South African bank to a foreign person; SARS' 2026 Budget Review describes it as "exempt if payable by SA government or bank". Two carve-outs still apply — the back-to-back arrangement rule in s50D(2) and the days-present rule in s50D(3) — and those three characters decide whether your 7% is 7% or 5.95%.
Taiwan's side is simpler. Offshore income is counted in full only once the household total reaches NT$1,000,000 for the year; NT$70,000 is far below that. The basic-income-tax exemption has been NT$7,500,000 since the 2024 tax year, with any excess taxed at 20% and then compared against ordinary income tax, whichever is higher. On the South African side, interest paid to a non-resident bank depositor is generally exempt from withholding tax, so the Taiwan rules are what decide.